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Take your pick. WP bearing fails which is usually the failure made. When that happens with the Composite impeller the plastic breaks off and the pieces of plastic clog the very small coolant passages in the head leading to localised overheating and a cracked head.
Metal impeller? WP bearing fails and now the metal impeller chews a hole in the block that is not repairable. Motor is done.
I say just replace the plastic impeller WP every 5 ish years or so.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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